Coated Sodium Percarbonate Particles Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sodium percarbonate particles used in detergents and cleaning agents face storage stability issues due to moisture sensitivity, leading to undesirable loss of active oxygen when coated with borate-containing shell layers, which also result in high boron content in wastewater.
Innovation Solution
Sodium percarbonate particles with a shell layer comprising 70-99.8% anhydrous sodium sulfate and 0.2-20% sodium borate, providing improved stabilization and reducing boron content, along with a core containing sodium carbonate perhydrate and optional stabilizing additives like alkali metal silicates, enhance storage stability and reduce active oxygen loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sodium percarbonate particles are coated with borate-containing shell layers to improve storage stability, then storage stability is improved, but boron content in wastewater increases
Solution Approach 1:
The patent changes the compositional parameters of the shell layer by strictly limiting borate content to 0.2-20% by weight (preferably 0.5-5%) while making sodium sulfate the dominant component at 70-99.5% by weight. This parameter change maintains the stabilizing effect on sodium percarbonate while dramatically reducing boron discharge into wastewater, thus resolving the contradiction between storage stability and environmental harm.
Solution Approach 2:
The patent creates a composite shell layer material combining sodium sulfate (primary component) with small amounts of borates and optional stabilizers like alkali metal silicates. This composite approach leverages the moisture-barrier properties of sodium sulfate while using minimal borate for stabilization, achieving both good storage stability and reduced boron content in wastewater compared to conventional borate-heavy coatings.
2Reliability
If sodium percarbonate particles are coated with shell layers to prevent moisture effect, then storage stability is improved, but active oxygen loss occurs during storage
Solution Approach 1:
The patent optimizes the shell layer composition parameters by controlling borate content at 0.2-20% (preferably 0.5-5%) and sodium sulfate at 70-99.5% by weight, with precise control over layer thickness (1-10% of particle mass). These parameter changes create a shell layer that provides adequate moisture protection without being so thick or chemically reactive as to cause significant active oxygen loss, thus resolving the contradiction between moisture protection and active oxygen preservation.
Solution Approach 2:
The shell layer acts as an intermediary barrier between the sodium percarbonate core and the external moisture environment. By using sodium sulfate as the primary component with controlled porosity and crystalline structure, the shell provides moisture protection while maintaining gas permeability that allows controlled release of active oxygen, preventing both moisture ingress and excessive oxygen trapping that would lead to decomposition.
3Reliability
If shell layer contains high borate content for stabilization, then storage stability is improved, but shell layer mass increases
Solution Approach 1:
The patent changes the compositional parameters by limiting borate content to 0.2-20% by weight (preferably 0.5-5%) and making sodium sulfate the dominant component at 70-99.5% by weight. This parameter change achieves effective stabilization with minimal shell layer mass, as sodium sulfate provides the primary protective function while borate acts as a minor stabilizing agent, thus resolving the contradiction between stabilization effectiveness and shell layer mass.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sodium percarbonate particles exhibit enhanced storage stability in detergents and cleaning agents, minimizing active oxygen loss and preventing caking or self-heating, thus ensuring safer storage and improved performance in moist environments.
Implementation Method 1
the coating layer preventing the effect of moisture on the coated sodium percarbonate particles
Implementation Method 2
sodium percarbonate is sensitive to moisture and decomposes in detergent and cleaning agent preparations when exposed to moisture and loses active oxygen
Data Source
AI summary
Sodium percarbonate particle (I) comprises a coating layer containing moisture free sodium sulfate (70-99.8 wt.%) and sodium borate (0.2-2 wt.%), where the parts by weight of the coating layer is 1-10% relative to the mass of the sodium percarbonate particles. Independent claims are included for a detergent and a cleaning agent containing (I).